JP4746952B2 - Document display method and document display apparatus - Google Patents

Description

  The present invention relates to a document display method and a document display device, and more particularly, to a document display method and a document display device for displaying a plurality of transmitted electronic documents during reception or after reception ends.

  With the development of digital technology, conventional analog television broadcasting is switching to digital television broadcasting, and in 2011 the replacement is about to be completed.

  In digital television broadcasting, information related to a program is broadcast as digital data together with video / audio data. Digital data representing information related to a program is broadcast as a BML (Broadcast Markup Language) document. One program usually includes a plurality of BML documents, which are broadcast within one transport or across a plurality of transports. One BML document is broadcast according to the carousel transmission method.

  The BML documents are linked to each other, and the digital TV broadcast tuner displays a video corresponding to another BML document when the user requests display of the video corresponding to another BML document while displaying the video corresponding to the certain BML document. Can display video corresponding to the other BML document.

  However, it cannot be said that the video transition time, which is the time from when there is a request to when the video corresponding to another BML document is displayed, is short.

Therefore, a BML document corresponding to a video that has already been displayed is temporarily stored in the BML document storage unit, or a BML document corresponding to a video that is predicted to be displayed is received in advance, and the BML document storage unit There is a technique for reducing the video transition time by temporarily storing the image (for example, see Patent Document 1). In addition, there is a technique for receiving a BML document before the broadcast time in order to alleviate the problem that there are few BML documents that can be temporarily stored in the BML document storage unit at the start of broadcasting (for example, Patent Documents). 2)
Japanese Patent Laid-Open No. 10-126753 JP 2002-16568 A

  In the above-described conventional technology, since the BML document is temporarily stored in the BML document storage unit, the waiting time required for newly receiving the entire BML document corresponding to the newly displayed video (for example, the time required for the carousel reception process) ) Can be reduced.

  However, in order to display an image based on a BML document, first, intermediate data (DOM (Document Object Model) tree data) is generated based on the BML document (original document), and the image is displayed based on the intermediate data. Need to be displayed. Therefore, every time video display corresponding to a new BML document is started, the intermediate data stored in the intermediate data storage unit is discarded, and new intermediate data is generated based on the new BML document. It is necessary to write new intermediate data to the intermediate data storage unit. For example, when displaying an image by a program, it is necessary to execute an intermediate data destructor program to discard the intermediate data, and to generate and write intermediate data, an intermediate data constructor program Need to run. The execution time of the constructor and destructor programs has been an obstacle to reduce the waiting time at the time of video transition.

  Therefore, the present invention provides a document display method capable of shortening the video transition time required for transition from the display of the video corresponding to the first original document to the display of the video corresponding to the second original document, and An object is to provide a document display device.

According to the first aspect of the present invention, based on a plurality of original documents, an intermediate data generation step for generating a plurality of intermediate data, a writing step for writing the plurality of intermediate data in a storage unit, and a storage unit A first video display step for displaying a first video corresponding to the first original document based on the first intermediate data among the plurality of stored intermediate data, and a second original document. If an operation for transitioning to the second video is detected while displaying the first video, the first video is based on the content of the operation, the content of the first intermediate data, and additional information. Based on an intermediate data specifying step for specifying one second intermediate data from a plurality of second intermediate data corresponding to two original documents and the second intermediate data stored in the storage unit, The second image corresponding to the second original document is Comprising a second image display step Shimesuru, wherein the additional information includes a document display method, wherein the current time der Rukoto represented by the time elapsed from the start broadcasting is provided.

By the second aspect of the present invention lever, the document display method all or part displays the images corresponding to different original document in each period, and generates the intermediate data corresponding to the original document for each period Correspondence generation step for generating information relating to the correspondence between the identification information of the original document and the identification information of the intermediate data for each period and the information for specifying each period as the correspondence for each period If the operation for displaying the video corresponding to the original document with the designation of time is detected, based on the designated time and the information generated in the correspondence generation step. Intermediate data specifying step for specifying intermediate data corresponding to the original document and corresponding to a period to which the designated time belongs as intermediate data corresponding to the original document; Based on the intermediate data specified among the data specifying step, document display method characterized by and a video display step of displaying an image corresponding to the original document is provided.

According to a third aspect of the present invention, in a document display method for displaying a video corresponding to an original document that differs in part or every period, intermediate data corresponding to the original document in a certain period, An intermediate data generation step for generating differential intermediate data corresponding to the original document for each subsequent period; identification information of the original document and intermediate data or differential intermediate data for each period as a correspondence relationship for each period; A correspondence generation step for generating information relating to the correspondence relationship, information for identifying each period, and information for identifying the range of the intermediate data or the difference intermediate data for each period, and a video corresponding to the original document If an operation with a time designation is detected, the operation is performed on the original document based on the designated time and the information generated in the correspondence generation step. And for each period corresponding to the intermediate data or difference intermediate data corresponding to the period to which the specified time belongs and the original document, and corresponding to each period before the period to which the specified time belongs. Intermediate data or differential intermediate data obtained by combining intermediate data specifying step for specifying intermediate data or differential intermediate data as intermediate data corresponding to the original document and intermediate data or differential intermediate data specified in the intermediate data specifying step There is provided a document display method comprising a video display step of displaying a video corresponding to the original document based on data.

By the fourth aspect of the present invention lever, based on a plurality of original document, and the intermediate data generation means for generating a plurality of intermediate data, and writing means for writing said plurality of intermediate data in the storage unit, said storage unit The first video display means for displaying the first video corresponding to the first original document based on the first intermediate data among the plurality of intermediate data stored in the memory, and corresponding to the second original document If an operation for transitioning to the second video is detected while displaying the first video, the content of the operation, the content of the first intermediate data, and additional information are used to Based on a plurality of second intermediate data corresponding to the second original document, intermediate data specifying means for specifying one second intermediate data, and second intermediate data stored in the storage unit, A second image displaying the second image corresponding to the second original document; Comprising a shows means, wherein the additional information, the document display apparatus is provided, which is a current time, represented by the time elapsed from the start of the broadcast.

According to the fifth aspect of the present invention, in a document display device that displays an image corresponding to an original document, which is partially or entirely different for each period, an intermediate for generating intermediate data corresponding to the original document for each period A data generation means, a correspondence generation means for generating information relating to the correspondence between the identification information of the original document and the identification information of the intermediate data for each period, and information that can specify each period as the correspondence for each period; , If an operation for displaying a video corresponding to the original document with a time designation is detected, based on the designated time and the information generated by the correspondence generation means Intermediate data specifying means for specifying intermediate data corresponding to the original document and corresponding to a period to which the designated time belongs, as intermediate data corresponding to the original document, and the intermediate data specifying means In based on a specific intermediate data, and image display means for displaying an image corresponding to the original document, the document display apparatus comprising: a is provided.

According to a sixth aspect of the present invention, in a document display device that displays an image corresponding to an original document that differs in part or every period, intermediate data corresponding to the original document in a certain period, Intermediate data generating means for generating differential intermediate data corresponding to the original document for each subsequent period; identification information of the original document and intermediate data or differential intermediate data for each period as a correspondence relationship for each period; A correspondence generation means for generating information related to the correspondence relationship, information that can specify each period, and information that can specify the range of the intermediate data or the difference intermediate data for each period, and a video corresponding to the original document If an operation for specifying a time is detected, the operation corresponds to the original document based on the specified time and the information generated by the correspondence generation unit, and Intermediate data corresponding to a period to which the designated time belongs, or intermediate data for each period corresponding to the intermediate data or difference intermediate data and the original document, and corresponding to each period before the period to which the designated time belongs Based on the intermediate data specified by combining the intermediate data specified by the intermediate data specifying means and the intermediate data specified by the intermediate data specifying means, or intermediate data specified by the intermediate data specifying means. And a video display means for displaying a video corresponding to the original document.

  According to the present invention, based on a plurality of original documents, an intermediate data generation step for generating a plurality of intermediate data, a writing step for writing the plurality of intermediate data in a storage unit, and a plurality of items stored in the storage unit A first video display step for displaying a first video corresponding to the first original document, and a second video corresponding to the second original document, based on the first intermediate data of the intermediate data. If an operation for transition is detected while displaying the first video, a second corresponding to the second original document is based on the content of the first intermediate data and additional information. An intermediate data specifying step for specifying intermediate data, and a second video display step for displaying the second video corresponding to the second original document based on the second intermediate data stored in the storage unit So that the first original document When the transition from the video display to the video display corresponding to the second original document is made, it is not necessary to generate the second intermediate data corresponding to the second original document, and therefore the transition time is shortened. Can do.

  The best mode for carrying out the present invention will be described below in detail with reference to the drawings.

[Embodiment 1]
FIG. 1 is a block diagram showing a configuration of a part related to reception and recording in a digital television broadcast receiving / recording / reproducing apparatus including a document display apparatus according to the first embodiment.

  An MPEG2-TS (Moving Picture Experts Group 2-Transport Stream) filter 101 includes a video / audio stream included in a partial transport stream corresponding to a program selected by a user or the like among a plurality of received transport streams, and its video stream. Carousel data included in the partial transport stream is output. The video / audio stream and carousel data included in the program can be identified by PID (Packet ID) 1, PAT (Program Association Table), PMT (Program Map Table), and the like.

  The video / audio stream file 103 is written in a recording medium 116 such as a hard disk.

  The data carousel collection unit 105 decodes a plurality of BML documents included in the program by performing a carousel reception process on the carousel data. An example of the original document in the present invention is a BML document. The original document may be, for example, a document similar to a BML document, an XML document, or the like.

  The BML decoding processing unit 107 generates each DOM tree data 109 based on each BML document. An example of the intermediate data of the present invention is DOM tree data. The intermediate data may be data similar to the DOM tree data.

  A plurality of DOM tree data 109 corresponding to a plurality of BML documents included in the program are also written in the recording medium 116.

  The display / operation management unit 111 generates an index file 113 based on a plurality of BML documents. The index file 113 is also written on the recording medium 16. The index file 113 is a file that is referred to when displaying the video corresponding to the BML document, and is particularly a file that is referred to when changing the DOM tree data that is the basis of the video.

  The part surrounded by the CPU 115 in FIG. 1 can be realized by hardware, but can also be realized by the computer reading and executing a program for causing the computer to function as these parts. . The same applies to the other drawings.

  FIG. 2 is a block diagram showing a configuration of a part related to reproduction in the digital television broadcast receiving / recording / reproducing apparatus including the document display apparatus according to the first embodiment.

  The MPEG2 video decoder 117 decodes video based on the video / audio stream 103 recorded on the recording medium 116. The video decoding process includes IDCT (Inverse Discrete Cosine Transform) based on the MPEG2 system, motion correction, inter-frame processing, and the like.

  The video synthesizing unit 119 synthesizes the video supplied from the MPEG video decoder 117 and the video supplied from the BML decoding processing unit 107 and outputs the synthesized video to a display device (not shown).

  The MPEG2 audio decoder 121 decodes audio based on the video / audio stream 103. The audio decoding process includes an IMDCT (Inverse Modified Discrete Cosine Transform) based on the AAC (Advanced Audio Coding) method.

  The voice synthesizer 123 synthesizes the voice supplied from the MPEG voice decoder 121 and the voice supplied from the BML decoding processor 107 and outputs the synthesized voice to a voice output device (not shown).

  The BML decoding processing unit 107 generates a video corresponding to the BML document based on the DOM tree data 109 specified by the display / operation management unit 111 among the plurality of DOM tree data 109 recorded on the recording medium 116. .

  The display / operation management unit 111 is configured to display a BML document to be displayed next based on a user operation input by the user interface 125 such as a remote controller and the DOM tree data 109 that is a basis of the currently displayed video. Is identified. Based on the identification information of the specified BML document and the index file 113, the DOM data 109 to be used as the basis of the display video is specified from the one or more DOM tree data 109 corresponding to the specified BML document. . Then, it instructs the BML decode processing unit 107 to generate a video based on the specified DOM data 109.

  Next, a method for generating DOM tree data and an index file performed by the BML decoding processing unit 107 when receiving and recording a digital television broadcast will be described.

  3 and 4 are flowcharts for explaining a method of generating the DOM tree data 109 and the index file 113 performed at the start of the program.

  First, the component tag of the elementary stream including the BML document startup.bml to be displayed first is substituted into the “component tag” that is a variable (step S201).

  Next, the ID of the module containing the BML document startup.bml is substituted into the “module ID” that is a variable (step S203).

  Next, the file name “startup.bml” is substituted into a variable “file name” (step S205).

  Here, the component tag is identification information of each elementary stream in one transport stream, the module ID is identification information of each module in one elementary stream, and the file name is each information in one module. This is file identification information. A BML document can be specified by “component tag”, “module ID”, and “file name”.

  Next, the function function is executed (step S207).

  Referring to FIG. 4, in the function function, DOM tree data 109 is first generated based on the BML document specified by “component tag”, “module ID”, and “file name” (step S207-1). Since this generation method is a publicly known / public technology, the description thereof is omitted.

  Next, the DOM tree data 109 generated in step S207-1 is written to the recording medium 116 (step S207-3). The body of the file name of the DOM tree data 109 to be written may include the body of the file name of the BML document that is the basis of the DOM tree data 109, and the extension of the file name of the DOM tree data 109 to be written may be dom. The file name of the tree data 109 may be anything as long as each DOM tree data 109 can be distinguished from other DOM tree data 109. Each time the content of the same BML document changes, DOM tree data reflecting the change is generated. The DOM tree data is given a file name different from the DOM tree data corresponding to the BML document before the change. Thus, the DOM tree data can be distinguished. Alternatively, the file names of these DOM tree data may be the same, and a version information field for distinguishing these DOM tree data may be provided in the index file.

  Further, when writing the DOM tree data 109 to the recording medium 116, an accompanying JPEG file or the like is also written. The same applies to the reading of the DOM tree data 109.

  Next, a record related to the DOM tree data 109 written in the recording medium 116 in step S207-3 is added to the index file 113 (step S207-5).

  Here, the index file 113 is configured as shown in FIG. 5 and holds the display start time and display end time of each BML document specified by the combination of the component tag, module ID, and file name. , Each BML document identified by a set of module ID and file name, identification information of DOM tree data corresponding to a set of display start time and display end time (for example, a file name or a set of file name and version) It represents.

  Currently, since a record related to the DOM tree data 109 corresponding to the BML document startup.bml transmitted from the start of broadcasting is added, the component tag, module ID, and file regarding the BML document startup.bml transmitted at the start of broadcasting are added. Write names (eg, 0x40, 0x0000, startup.bml, respectively) in the appropriate fields. Also, 0 minute 0 second which is the broadcast start time is written in the corresponding field. Furthermore, the identification information (for example, file name startup.dom) of the DOM tree data corresponding to the BML document startup.bml transmitted from the start of broadcasting is written in the corresponding field. The display end time is not yet written because it is still unknown.

  Next, all transition description parts within the BML document currently being processed are searched (steps S207-7 and S207-9). FIG. 6 shows three examples of transition description parts. The processing from step S207-11 is performed on each transition description part.

  In step S207-11, the component tag of the elementary stream including the transition destination BML document described in the transition description part is substituted into the “component tag” that is a variable.

  Next, the ID of the module including the transition destination BML document described in the transition description part is substituted into the “module ID” that is a variable (step S207-13).

  Next, the file name of the transition destination BML document described in the transition description part is substituted for “file name” which is a variable (step S207-15).

  Next, the function function is recursively executed (step S207).

  If the BML document startup.bml has three transition description parts as shown in FIG. 6, the function function is executed three times accordingly. As a result, the three DOM tree data tenki.dom and news.dom And kabu.dom are generated and written to the recording medium 116. In addition, the second to fourth records shown in FIG. 5 are added to the index file 113.

  For example, if the BML document tenki.bml also has a transition description part, the function function is recursively executed to respond to the transition destination BML document from the BML document tenki.bml. DOM tree data is generated and written to the recording medium 116, and a record corresponding to the DOM tree data is added to the index file 113.

  Further, the DOM tree data generated in step S207-1 includes a transition description part corresponding to the transition description part in the BML document. An example is shown in FIGS. FIG. 7A shows a structure representing each node in the DOM tree data. FIG. 7B shows a structure representing a cdata node provided under the node shown in FIG. FIG. 7C shows a specific description of * str_cdata_section which is a pointer variable in a specific cdata node corresponding to the first transition description part of the three transition description parts shown in FIG. As is clear from FIG. 7C, even in the DOM tree data, the transition destination is the component tag (50 in the example of FIG. 7C), the module ID (0000 in the example of FIG. 7C), and the BML document. The file name (tenki.bml in the example of FIG. 7C) is specified.

  By the way, the display start time and the display end time are represented, for example, by an elapsed time from the program start time. Then, the display start time and the display end time can be obtained based on the time when the trigger for updating the BML document to be displayed has been broadcast, the component tag that is accompanying information of the trigger, the module ID, and the like. For example, FIG. 5 shows an index file 113 corresponding to a program in which the BML document news.bml is updated after 45 minutes and 0 seconds have elapsed since the start of broadcasting. A trigger is broadcast 45 minutes and 0 seconds after the start of broadcasting, and a BML document news.bml having a new content is also broadcast. Accordingly, the display end time of the first news.bml is 45 minutes and 0 seconds, and the display end time of news.dom is correspondingly 45 minutes and 0 seconds. Further, it is necessary to generate new DOM tree data corresponding to the BML document “news.bml” having a new content, and to add a record corresponding thereto to the index file 113. In addition, the entire BML document may be updated, but only a portion related to a part of nodes or less in the DOM tree data of the BML document may be updated.

  FIG. 8 is a diagram for explaining a method of generating DOM tree data and an index file that are performed when all or part of a certain BML document is changed or a new BML document is added in the middle of a program. It is a flowchart of.

  First, it continues to wait until a trigger is received (step S211).

  If the trigger is received, node identification information attached to the trigger is acquired (step S213). Here, the node identification information is information (a set of a component tag, a module ID, and a file name) for identifying a BML document related to the update, and a tree related to the update in the DOM tree data generated based on the BML document. This information is a combination of node identification information in a narrow sense for specifying a vertex node.

  Next, a BML document having new contents is received (step S215).

  Next, it is determined whether or not the node at the top of the tree related to the update is the root of the DOM tree (step S217).

  If so (YES in step S217), it means that the entire BML document that has already been broadcast is updated, or that a new BML document has been broadcast. Accordingly, the DOM tree data 109 for the entire BML document is generated based on the entire BML document received in step S215 (step S219).

  Next, the DOM tree data 109 generated in step S219 is written to the recording medium 116 (step S221). At this time, the file name of the DOM tree data 109 is different from the file name of the existing DOM tree data. As a result, regarding the BML document whose contents are updated even if the file names are the same, the DOM tree data 109 corresponding to the contents before the update and the DOM tree data 109 corresponding to the contents after the update can be distinguished. Become. Alternatively, as described above, the file name may be the same, and the version information field may be provided in the index file 113.

  Next, a record related to the DOM tree data 109 written in the recording medium 116 in step S221 is added to the index file 113. The component tag of the record to be added, the module ID, and the file name of the BML document are obtained from the accompanying information of the trigger, and the display start time is the time when the trigger is received. Further, it is assumed that the file name of the DOM tree data is determined in step S221. For example, when the BML document news.bml is updated after 45 minutes and 0 seconds have elapsed, the display start time of the new record is set to 45 minutes and 0 seconds, and the file name of the DOM tree data is set to news $ 2.dom. When distinguishing by version information, the file name of DOM tree data may be news.dom and the version information may be 2.

  Next, it is determined whether or not there is a corresponding unfilled display end time in the index file 113 (step S225). If there is (step S225), the trigger reception time is substituted for the display end time (step S227). In the above example, 45 minutes and 0 seconds are substituted into the display end time field in the record for the DOM tree data news.dom.

  On the other hand, when the node at the top of the tree related to the update is not the root of the DOM tree (NO in step S217), this means that a part of the BML document that has already been broadcast is updated. Therefore, the BML document is specified from the accompanying information of the trigger, the latest DOM tree data is searched from the index file 113 before receiving the trigger among the one or more DOM tree data corresponding to the BML document, and the DOM tree data is searched for. Reading from the recording medium 116 (step S229).

  Next, partial DOM tree data is generated based on the BML document received in step S215 (step S231).

  Next, new DOM tree data is generated by replacing a part of the DOM tree data read in step S229 with the partial DOM tree data generated in step S231 (step S233).

  From step S233, the process proceeds to S221. Since the operation after S221 has already been described, redundant description is omitted.

  If YES in step S217 or NO, if step S227 ends, the process returns to step S211 and waits until the next trigger is received. Note that step S207 (FIG. 4) may be executed for the transition description part in the BML document received in step S215.

  Even when the processing described with reference to FIGS. 3, 4, and 8 is performed, the index file 113 has an unfilled display end time. This is the display end time to which the broadcast end time should be substituted. Therefore, as shown in FIG. 9, if there is a display end time not yet written in the index file 113 at the end of the broadcast (step S231), the broadcast end time is substituted there (step S233). However, for the DOM tree data corresponding to the BML document whose display end is designated by the trigger, the reception time of the trigger is substituted for the display end time of the corresponding record in the index file 113 when the trigger is received.

  At the time of reproduction, first, the DOM tree data in which the time of the reproduction start portion of the DOM tree data 109 corresponding to the BML document startup.bml is included in the display period (the period from the display start time to the display end time in the index file 113). Display video based on. Even if the user interface 125 accepts a command from the user or the display content should be changed by the description of the DOM tree data, the video can be displayed as long as the same DOM tree data is used. There is no need to change the DOM tree data. Whether or not it is necessary is determined by the display / operation management unit 111 based on the DOM tree data and the commands that are the basis of the currently displayed video.

  Next, transition processing between BML documents performed by the BML decoding processing unit 107, the display / operation management unit 111, and the like when playing back a digital television broadcast will be described.

  Referring to FIG. 10, first, the process waits until a transition command is detected (step S241).

  If a transition command is detected (YES in step S241), for example, based on the description of which cdata node in the DOM tree data based on the object currently focused on the video, the pressed button on the remote control, or the like. And a transition destination BML document is identified based on the description of the cdata node (step S243).

  Next, the current time is acquired (step S245). Here, the current time is represented by the elapsed time from the start of the broadcast as in the case of receiving the broadcast. For example, the current time is acquired by the MPEG2 video decoder 117 from the video / audio stream displaying the decoded video at the same time.

  Next, for all records corresponding to the BML document identified in step S243 among all the records corresponding to the program currently reproduced in the index file 113, the time acquired in step S245 is the record. It is determined whether it is greater than or equal to the described display start time and less than the display start time described in the record (steps S247 and S249).

  If such a record can be found (YES in step S249), the DOM tree data of the file name described in the record is read from the recording medium 116 (step S251), and based on the DOM tree data. A video is displayed (step S253). When a plurality of DOM tree data corresponding to the same BML document have the same file name and are distinguished by other information (for example, serial number), for example, the other DOM tree data in the header part of the DOM tree data In step S251, the file name and the other information are acquired from the record, and the value of the other information among all the DOM tree data having the file name corresponds to the time acquired in step S245. The DOM tree data to be read may be read from the recording medium 116.

  Next, the process returns to step S241 and waits until the next transition command is input (step S241).

  By doing this, for example, a video is currently displayed based on the DOM tree data corresponding to the BML document startup.bml, and a command for changing to the video corresponding to the BML document news.bml is detected at time 30 minutes. When the video is displayed, the video is displayed based on the DOM tree data news.dom, and on the other hand, the video is displayed based on the DOM tree data corresponding to the BML document startup.bml at the time of 50 minutes. When a command for transitioning to a video corresponding to the BML document news.bml is detected, the video is displayed based on the DOM tree data news $ 2.dom. In this way, it is possible to reproduce the state at the time of broadcast reception.

  Further, if the time 45 minutes 0 seconds comes when the video is displayed based on the DOM tree data news.dom, the video may be continuously displayed based on news $ 2.dom. For this purpose, the BML document that is the basis of news.dom is searched from the index file, and the DOM tree data corresponding to the searched BML document that has a display start time of 45 minutes 0 seconds is indexed. Search from a file. If the BML document “news.bml” should be displayed in 45 minutes and 0 seconds, and there is no news $ 2.dom, it is DOM tree data corresponding to the searched BML document, and the time is 45 minutes and 0 minutes. Items with seconds as the display start time are not searched from the index file. In this case, the video may be displayed based on the DOM tree data corresponding to the BML document startup.bml including the time 45 minutes 0 seconds between the display start time and the display end time.

  Also, if the time 45 minutes 0 seconds arrives while displaying the video based on the DOM tree data news.dom, the DOM tree data corresponding to the BML document startup.bml is suddenly unconditionally and the time 45 minutes. You may make it display an image | video based on what includes 0 second between display start time and display end time.

  Each time the BML document startup.bml is updated, new DOM tree data corresponding to the BML document startup.bml is generated, and the update time is substituted for the display start time of the new DOM tree data. However, when the DOM tree data corresponding to the BML document startup.bml is constantly monitored such that the current time is the display start time at the time of reproduction, and such DOM tree data is found, A video corresponding to the BML document startup.bml may be forcibly displayed based on the DOM tree data.

  Further, the time restriction is removed, and a list video such as thumbnails is displayed based on all the DOM tree data corresponding to the transition destination BML document identified in step S243, and the user is allowed to select a favorite one. Alternatively, a plurality of videos may be displayed by time division or screen area division based on all the DOM tree data corresponding to the transition destination BML document identified in step S243.

  Further, instead of detecting the current time in step S245, the user is allowed to designate the time by operating the slide bar or inputting a numerical value, and the video is displayed based on the DOM tree data corresponding to the designated time. You may do it.

  If a command for displaying a BML document is detected in a state where no BML document is displayed, a video based on the BML document startup.bml document is first displayed. In this case, by referring to the index file 113, the current time (the time of the video being played back) or the specified time (for example, the time when the numerical value is input, the time specified with the slide bar) is displayed. The DOM tree data between the display end time and the display end time is searched from all the DOM tree data corresponding to the BML document startup.bml, and the video corresponding to the DOM tree data is displayed.

[Embodiment 2]
In the first embodiment, new DOM tree data for the entire BML document is generated even when only the updated portion of the BML document is newly sent.

  On the other hand, in the second embodiment, when only the updated part of the BML document is newly sent, DOM tree data for only the updated part is newly generated.

  Accordingly, the index file 113 is provided with a field for the names of the nodes at the vertices of the DOM tree data, as shown in FIG.

  FIG. 12 illustrates a method of generating DOM tree data and an index file performed when all or part of a certain BML document is changed or a new BML document is added in the middle of a program in the second embodiment. It is a flowchart for doing. Only differences from FIG. 8 showing the similar method of the first embodiment will be described.

  Step S229 in the first embodiment is deleted because data to be taken over from the previous DOM tree data to the new DOM tree data is unnecessary. Also, step S223 replaces step S223B, and here, the partial DOM tree data for only the update location is written to the recording medium 116. Step S223 replaces step S223B. Here, in addition to the content written in step S223, the name of the node at the vertex of the DOM tree data or partial DOM tree data written in the recording medium 116 is added to the index file 113. Write.

  FIG. 13 is a flowchart for explaining transition processing between BML documents performed by the BML decoding processing unit 107 and the display / operation management unit 111 BML decoding processing unit 107 and the like when playing back a digital television broadcast in the second embodiment. . Only differences from FIG. 10 showing the same method of the first embodiment will be described.

  Steps S255, S257, and S259 are added between step S251 and step S253.

  The DOM tree data read in step S251 is set as DOM tree data # 1. This is stored temporarily.

  In step S255, of all the DOM tree data corresponding to the BML document identified in step S243, the previous DOM tree data #n read at the previous time (at the time of execution of step S251 or the previous step S255). The DOM tree data # (n + 1) is read out and temporarily stored. In step S257, it is determined whether the DOM tree data read in step S255 is from the root (that is, whether the DOM tree data is not partial DOM tree data but entire DOM tree data). Otherwise, the process returns to step S255. If so, the process proceeds to step S259. In step S259, the entire DOM tree data for display is generated by synthesizing the DOM tree data # 1 to #N temporarily stored in step S251 and all the repeated steps S255. At the time of composition, initialization is performed with the oldest DOM tree data (DOM tree data obtained in the last step S255), and then the next DOM tree data (DOM tree data obtained in the previous step S255 or in step S251). The tree portion below the vertex of the DOM tree data is updated with the obtained DOM tree data. According to the second embodiment, compared to the first embodiment, when a part of the BML document is updated, the amount of DOM tree data to be recorded on the recording medium can be reduced.

[Embodiment 3]
The third embodiment is basically the same as the first or second embodiment, but has the following additional functions.

  In the third embodiment, when a user views a digital television broadcast simultaneously with reception and recording, the DOM tree data corresponding to the user is already generated and the BML document recorded on the recording medium 116 is recorded on the recording medium 116. For BML documents for which video is generated based on the DOM tree data recorded in, and the corresponding DOM tree data is not yet generated, DOM tree data is generated based on the BML document as before, Generate video based on this.

  Referring to FIG. 14, the data carousel collection unit 105 writes the received BML document 127 to the recording medium 116, and the BML decoding processing unit 107 reads the BML document 127 from the recording medium 116, and based on this, the DOM tree data 109 is generated. The DOM tree data 109 is written on the recording medium 16. At the same time, the corresponding record is added to the index file 113.

  When the DOM tree data 109 that is the basis of the video that needs to be displayed has already been recorded on the recording medium 116, the BML decoding processing unit 107 reads the DOM tree data 109 from the recording medium 16 and uses it. Generate video based on this. On the other hand, if the DOM tree data 109 that is the basis of the video that needs to be displayed is not recorded on the recording medium 116, the BML decode processing unit 107 reads the BML document 127 from the recording medium 16 and reads it out. Based on this, DOM tree data is generated, and an image is generated based on the DOM tree data. The DOM tree data generated at this time may be written in the recording medium 116 and the corresponding record may be added to the index file 113.

  In the third embodiment, when viewing at the same time as recording, it is possible to speed up the display by effectively using the already generated DOM tree data. Even when only viewing is performed, the BML document can be displayed at a higher speed by using the third embodiment. In this case, the DOM tree data 109 and the index file may be deleted from the recording medium 16 after the viewing ends.

[Embodiment 4]
The fourth embodiment is basically the same as the first or second embodiment, but has the following additional functions.

  In the fourth embodiment, all or a part of a plurality of DOM tree data corresponding to a program and a record corresponding to all or a part of the DOM tree data among a plurality of records of the index file may be generated internally. Without downloading from the outside.

  Referring to FIG. 15, the communication processing unit 127 receives an index file having one or more DOM tree data and a record corresponding thereto from a server (not shown) connected to a network such as the Internet using a protocol such as TCP / IP. to download. The downloaded DOM tree data 129 and the index file 131 are written in the recording medium 116.

  During playback, the BML decode processing unit 107 and the display / operation management unit 111 include the downloaded DOM tree data 129, the internally generated DOM tree data 109, the downloaded index file 131, and the internally generated index file 113. A video is generated on the basis of and the transition is controlled. Except for adding the communication processing unit 127 by referring to both index files to determine the DOM tree data of the transition destination and making the recording area (directory, etc.) of both DOM tree data common. There is no need to make a major change to the first or second embodiment.

  In the fourth embodiment, even a computer with low calculation capability for generating DOM tree data can speed up video transition.

[Embodiment 5]
In the fifth embodiment, a plurality of thumbnail videos are generated based on a plurality of DOM tree data, and all or some of the plurality of thumbnail videos are displayed simultaneously.

  Referring to FIG. 16, the thumbnail generation unit 141 generates a thumbnail video 143 based on the video generated by the BML decode processing unit 107 based on each DOM tree data. By doing so, a plurality of thumbnail images 143 corresponding to the plurality of DOM tree data 109 are recorded on the recording medium 116.

  Also, the BML decode processing unit 107 generates a transition relationship between the thumbnail videos (the relationship between the transition source and the transition destination, the transition possible period) based on the transition description unit of the DOM tree data 109 and the index file 113, The thumbnail image display unit 145 is supplied.

  The thumbnail video display unit 145 reads a plurality of thumbnail videos from the recording medium 116 and generates a list video for displaying them simultaneously. Moreover, the transition relationship between thumbnail images is also used as necessary. Also, data for displaying a plurality of thumbnail videos in a time division manner may be generated.

  The video composition unit 119 adds the video from the MPEG2 video decoder 117 as a background to the list video as necessary, and outputs it to the display device.

  FIG. 17 shows an example in which thumbnail images are simply arranged horizontally. The thumbnail images may be arranged in the order in which they are arranged from the end to the other end when the tree obtained from the transition relationship is expanded. When the arrows at both ends of the screen are pressed, scrolling left and right may be performed. When a certain thumbnail is selected, a normal video corresponding to the thumbnail may be displayed on the entire screen.

  Further, all versions of all BML documents included in the program may be arranged. In this case, it may be simply arranged in the order of reception time, or may be arranged in groups for each same BML document.

  Alternatively, the user may designate a time by operating a scroll bar or inputting a numerical value, and only thumbnail images corresponding to the BML document at that time may be arranged.

  FIG. 18 shows an example of the transition relationship of the BML document. FIG. 19 shows a display method for switching the thumbnail video to be displayed in accordance with the button selected on the thumbnail video based on this transition relationship. In order to be able to select a button directly on the video, a reduced normal video may be displayed instead of a thumbnail video, but it is possible to display a thumbnail video and select a button by alternative means. It may be possible.

  In FIG. 19A, the button # 2 is selected in the leftmost BML document # 1, and the BML document # 2 is displayed on the right side in response thereto, and the button # 4 is selected in the BML document # 2. Accordingly, an example is shown in which the BML document # 4 is displayed on the right side.

  In FIG. 19B, the button # 2 is selected in the leftmost BML document # 1, the BML document # 2 is displayed on the right side in response to this, the button # 5 is selected in the BML document # 2, and Accordingly, an example is shown in which BML document # 5 is displayed on the right side.

  In FIG. 19C, the button # 3 is selected in the leftmost BML document # 1, the BML document # 3 is displayed on the right side in response thereto, and the button # 6 is selected in the BML document #. In this example, BML document # 6 is displayed on the right side.

  In FIG. 19D, the button # 3 is selected in the leftmost BML document # 1, the BML document # 3 is displayed on the right side in response thereto, and the button # 7 is selected in the BML document #. In this example, BML document # 7 is displayed on the right side.

  If a thumbnail video is selected, a normal video corresponding to the thumbnail video may be displayed. If there are many tree hierarchies, a scroll object is provided on the screen, and when it is pressed, the screen is scrolled so that images in the upper and lower layers can be viewed. Also good. Similarly, when there are many videos in the same layer, a scroll object is provided on the screen, and when it is pressed, the screen is scrolled in the other direction so that the video at the end or the other end of the same layer can be viewed. You may be made to do. Further, when there are a plurality of versions in the same BML document, screens representing them may be arranged.

  Further, a tree structure as shown in FIG. 18 may be displayed on the screen. Then, an image may be displayed on each node. Alternatively, only the video of the selected node may be displayed. Further, when a video is selected, a normal video corresponding to the selected video may be displayed. The scrolling is the same as in the example of FIG. In addition, when there are a plurality of versions in the same BML document, nodes representing them may be arranged below the nodes of the BML document.

  According to the fifth embodiment, since the entire BML document related to the program can be grasped, it becomes possible to efficiently search for an interesting BML document or a BML document that was being searched for.

[Embodiment 6]
In the sixth embodiment, a BML document is searched based on a category or keyword of contents described in the BML document.

  Referring to FIG. 20, the category / keyword extraction unit 151 extracts a category, a keyword, and a combination of the category and the keyword from each of the plurality of DOM tree data 109 recorded on the recording medium 116, and the file name of the DOM tree data 109. The category / keyword table 153 that holds the extracted contents and the corresponding relationship is written in the recording medium 116. The category is, for example, a category called weather forecast, the keyword is, for example, a stage name of a certain actor, and the combination of a category and a keyword is, for example, a combination of sports as a category and a fish as a keyword or as a category It is a combination of recipes and fish as keywords. The plurality of DOM tree data 109 may extend over a plurality of programs. In this way, the search range can be expanded.

  In order to extract keywords, for example, morphological analysis, syntax analysis, and the like are performed on text data in DOM tree data. The category may be known from, for example, the file name of the BML document corresponding to the DOM tree data. If the category cannot be extracted, only the keyword is extracted.

  The category / keyword input unit 155 inputs a category for search, a keyword, or a combination of a category and a keyword from the user using a user interface.

  The category / keyword input unit 155 collects categories, keywords, and combinations of categories and keywords that are sure to hit from the category / keyword table 153, and uses the user interface to request the user from among these. May be selected.

  The DOM tree data search unit 157 searches the category / keyword table 153 for a file name of DOM tree data having a category, a keyword, or a combination of a category and a keyword input or selected by the user.

  The BML decoding processing unit 107 reads one or more DOM tree data whose file names have been searched by the DOM tree data search unit 157 from the recording medium 116, and generates a video based on these.

  The screen configuration unit 159 displays the category, keyword, or combination thereof input from the category / keyword input unit 155, the file name and number of DOM tree data input from the DOM tree data search unit 157, and the video input from the BML decode processing unit 107. Configure and output the screen based on this. For example, the screens and arrangements to be configured may be as simple as shown in FIG.

It is a block diagram which shows the structure of the part relevant to reception and recording of the digital television broadcast receiving / recording / reproducing apparatuses including the document display apparatus by Embodiment 1 of this invention. It is a block diagram which shows the structure of the part relevant to reproduction | regeneration among the digital television broadcast receiving / recording / reproducing apparatuses containing the document display apparatus by Embodiment 1 of this invention. It is a flowchart (1/2) for demonstrating the method to produce | generate the DOM tree data and index file performed at the time of the program start by Embodiment 1 of this invention. It is a flowchart (2/2) for demonstrating the method to produce | generate the DOM tree data and index file performed at the time of the program start by Embodiment 1 of this invention. It is a figure which shows the structure and data example of an index file by Embodiment 1 of this invention. It is a figure which shows the example of the transition description part in a BML document. (A) is a figure which shows structure DOM_SCRIPT_ELEMENT of the node corresponding to the transition description part in DOM tree data, (b) is a figure which shows structure DOM_CDATA_ELEMENT of the node under the node shown to (a). Yes, (c) is an example of a character string to be assigned to * str_cdata_section of the structure shown in (b), and corresponds to the first transition description part shown in FIG. For explaining a method for generating DOM tree data and an index file when all or a part of a BML document in the middle of a program is changed or a new BML document is added according to Embodiment 1 of the present invention. It is a flowchart. It is a flowchart for demonstrating the method to produce | generate the DOM tree data and index file performed at the end of the program by Embodiment 1 of this invention. 5 is a flowchart for explaining a video transition method performed during reproduction according to the first embodiment of the present invention. It is a figure which shows the structure and data example of an index file by Embodiment 2 of this invention. For explaining a method for generating DOM tree data and an index file when all or part of a BML document in the middle of a program is changed or a new BML document is added according to the second embodiment of the present invention. It is a flowchart. 10 is a flowchart for explaining a video transition method performed during reproduction according to the second embodiment of the present invention. It is a block diagram which shows the structure of the digital television broadcast receiving / recording / reproducing apparatus containing the document display apparatus by Embodiment 3 of this invention. It is a block diagram which shows the structure of the digital television broadcast receiving / recording / reproducing apparatus containing the document display apparatus by Embodiment 4 of this invention. It is a block diagram which shows the structure of the digital television broadcast receiving / recording / reproducing apparatus containing the document display apparatus by Embodiment 5 of this invention. It is an example of the thumbnail image | list displayed by the digital television broadcast receiving / recording / reproducing apparatus containing the document display apparatus by Embodiment 5 of this invention. 10 is an example of a thumbnail video list displayed by a digital television broadcast receiving / recording / reproducing apparatus including a document display apparatus according to Embodiment 5 of the present invention and a transition relationship between a plurality of BML documents. 18 is another example of a thumbnail video list displayed by a digital television broadcast receiving / recording / reproducing apparatus including a document display apparatus according to Embodiment 5 of the present invention in correspondence with the transition relationship between a plurality of BML documents shown in FIG. is there. It is an example of the thumbnail image list displayed by the digital television broadcast receiving / recording / reproducing apparatus including the document display apparatus according to Embodiment 6 of the present invention.

Explanation of symbols

101 MPEG2-TS Filter 103 Video / Audio Stream 105 Data Carousel Collection Unit 107 BML Decode Processing Unit 109 DOM Tree Data 111 Display / Operation Management Unit 113 Index File 115 CPU
116 Recording Medium 117 MPEG2 Video Decoder 119 Video Synthesis Unit 121 MPEG2 Audio Decoder 123 Audio Synthesis Unit 125 User Interface

Claims (24)

An intermediate data generation step for generating a plurality of intermediate data based on a plurality of original documents;
A writing step of writing the plurality of intermediate data into a storage unit;
A first video display step of displaying a first video corresponding to the first original document based on first intermediate data of the plurality of intermediate data stored in the storage unit;
If an operation for transitioning to the second video corresponding to the second original document is detected while displaying the first video, the content of the operation, the content of the first intermediate data, and An intermediate data specifying step for specifying one second intermediate data from a plurality of second intermediate data corresponding to the second original document based on the additional information;
A second video display step for displaying the second video corresponding to the second original document based on the second intermediate data stored in the storage unit;
Equipped with a,
The additional information, document display wherein the current time der Rukoto represented by the time elapsed from the start of the broadcast. The document display method according to claim 1,
An index file generating step for generating an index file based on the plurality of original documents;
Subsequent to the index file generating step, substituting a display end time for the generated index file;
A document display method, further comprising: The document display method according to claim 1,
In the first intermediate data, a second original document is described as a transition destination,
The document display method, wherein the additional information further includes information on a correspondence relationship between the original document and the intermediate data. The document display method according to claim 3 ,
The correspondence relationship is represented by a correspondence relationship between the identification information of the original document and the identification information of the intermediate data,
A correspondence generation step for generating a correspondence between the identification information of the original document and the identification information of the intermediate data;
In the writing step, the correspondence relationship between the identification information of the original document and the identification information of the intermediate data is also written in the storage unit. The document display method according to claim 4 ,
All or part of the second original document varies from period to period,
In the intermediate data generation step, intermediate data corresponding to the second original document for each period is generated,
In the correspondence generation step, the correspondence between the identification information of the second original document and the identification information of the intermediate data for each period is generated as the correspondence for each period. The document display method according to claim 5 ,
A document display method characterized in that information that can specify each period is added to the correspondence relationship for each period. The document display method according to claim 6 ,
In the intermediate data specifying step, if an operation for transitioning to a second video corresponding to the second original document is detected while displaying the first video, the contents of the operation, Corresponding to the second original document, based on the contents of the first intermediate data and the correspondence relationship for each period included in the additional information, to which information that can specify each period is added, and Specifying intermediate data corresponding to a period to which the designated time belongs as the second intermediate data corresponding to the second original document;
In the second video display step, a video corresponding to the second original document is displayed based on the intermediate data specified in the intermediate data specifying step. The document display method according to claim 7 ,
When it is detected that the time continued from the designated time exceeds the period to which the designated time belongs, the intermediate data that is the basis of the video corresponding to the second original document is A document display method characterized by further comprising a step of changing to intermediate data corresponding to the second original document and corresponding to the next period. The document display method according to claim 4 ,
All or part of the second original document varies from period to period,
In the intermediate data generation step, intermediate data corresponding to the second original document in a certain period and difference intermediate data corresponding to the second original document in each period after that period are generated,
In the correspondence generation step, a correspondence between the identification information of the second original document and the intermediate data or difference intermediate data for each period is generated as the correspondence for each period. . The document display method according to claim 9 ,
A document display method characterized by adding information that can specify each period and information that can specify the range of the intermediate data or the difference intermediate data for each period to the correspondence for each period. The document display method according to claim 10 ,
In the intermediate data specifying step, if an operation for transitioning to a second video corresponding to the second original document is detected while displaying the first video, the first intermediate data is detected. Based on the relationship between the contents and the additional information, the information in which each period can be specified, and the information in which the intermediate data or the difference intermediate data in each period can be specified The period corresponding to the second original document and corresponding to the period to which the designated time belongs, or the intermediate data or difference intermediate data and the second original document, and the period to which the designated time belongs Identifying intermediate data or differential intermediate data for each period corresponding to each previous period as the second intermediate data corresponding to the second original document;
In the second video display step, the second data corresponding to the second original document is based on the intermediate data obtained by combining the intermediate data or the difference intermediate data specified in the intermediate data specifying step. A document display method characterized by displaying an image. The document display method according to claim 11 ,
When it is detected that the time continuing from the designated time exceeds the period to which the designated time belongs, intermediate data that is the basis of the video corresponding to the second original document is The intermediate data corresponding to the second original document and corresponding to the next period or the current intermediate data is updated with the difference intermediate data corresponding to the second original document and corresponding to the next period. A document display method, further comprising a step of changing to intermediate data obtained by the above. The document display method according to claim 4 ,
The display period of a certain original document is limited to a certain period,
In the correspondence generation step, information that can specify the certain period is added to the correspondence between the identification information of the certain original document and the identification information of the intermediate data corresponding thereto,
Displaying an image corresponding to the certain original document based on the intermediate data corresponding to the certain original document;
If it is detected that the time has passed the certain period, ending display of the video corresponding to the certain original document;
A document display method characterized by further comprising: The document display method according to claim 1,
A document display method, further comprising a simultaneous display step of simultaneously displaying two or more videos corresponding to two or more original documents based on two or more intermediate data written in the storage unit. The document display method according to claim 14 .
In the simultaneous display step, when the transition destination selected in the first video corresponding to the first original document is the second video corresponding to the second original document, the second video is displayed. When the transition destination selected with the first video is the third video corresponding to the third original document, the third video is displayed together with the first video. A document display method characterized by displaying together with video. The document display method according to claim 14 .
In the simultaneous display step, in addition to the two or more videos, or instead of the two or more videos, a document representing a connection relationship between a transition source and a transition destination is displayed. The document display method according to claim 1,
Based on the intermediate data corresponding to the specific original document including the content of the predetermined category, the predetermined keyword, or the predetermined keyword in the predetermined category among the plurality of intermediate data stored in the storage unit, the specific original A document display method, further comprising a specific image display step of displaying an image corresponding to the document. In a document display method for displaying a video corresponding to an original document, which is partially or entirely different for each period,
An intermediate data generation step for generating intermediate data corresponding to the original document for each period;
A correspondence generation step for generating information relating to the correspondence between the identification information of the original document and the identification information of the intermediate data for each period as the correspondence for each period, and information for identifying each period;
If an operation for displaying a video corresponding to the original document with a time designation is detected, based on the designated time and the information generated in the correspondence generation step, An intermediate data specifying step for specifying intermediate data corresponding to the original document and corresponding to a period to which the designated time belongs, as intermediate data corresponding to the original document;
A video display step for displaying a video corresponding to the original document based on the intermediate data specified in the intermediate data specifying step;
A document display method comprising: In a document display method for displaying a video corresponding to an original document, which is partially or entirely different for each period,
Intermediate data generation step for generating intermediate data corresponding to the original document in a certain period and differential intermediate data corresponding to the original document for each period after that period;
Information on the correspondence between the identification information of the original document and the intermediate data or difference intermediate data for each period, information that can specify each period, and the intermediate data or difference intermediate for each period A correspondence generation step for generating information that can specify a range of data;
If an operation for displaying a video corresponding to the original document with a time designation is detected, based on the designated time and the information generated in the correspondence generation step, In each period corresponding to the original document and corresponding to the intermediate data or differential intermediate data corresponding to the period to which the specified time belongs and the original document and before the period to which the specified time belongs An intermediate data specifying step for specifying intermediate data or differential intermediate data for each corresponding period as intermediate data corresponding to the original document;
A video display step for displaying a video corresponding to the original document based on the intermediate data obtained by combining the intermediate data or the differential intermediate data specified in the intermediate data specifying step;
A document display method comprising: The document display method according to any one of claims 1 to 19 ,
The document display method, wherein the original document is a BML document, and the intermediate data is DOM tree data. Intermediate data generating means for generating a plurality of intermediate data based on a plurality of original documents;
Writing means for writing the plurality of intermediate data in a storage unit;
First video display means for displaying a first video corresponding to a first original document based on first intermediate data among a plurality of intermediate data stored in the storage unit;
If an operation for transitioning to the second video corresponding to the second original document is detected while displaying the first video, the content of the operation, the content of the first intermediate data, and Intermediate data specifying means for specifying one second intermediate data from a plurality of second intermediate data corresponding to the second original document based on the additional information;
Second video display means for displaying the second video corresponding to the second original document based on the second intermediate data stored in the storage unit;
Equipped with a,
The additional information, the document display comprising a current time der Rukoto represented by the time elapsed from the start of the broadcast. In a document display device that displays video corresponding to an original document that is different in whole or part by period,
Intermediate data generating means for generating intermediate data corresponding to the original document for each period;
Correspondence generation means for generating information relating to the correspondence between the identification information of the original document and the identification information of the intermediate data for each period and information that can specify each period as the correspondence for each period;
If an operation for displaying a video corresponding to the original document and accompanied by a designation of time is detected, based on the designated time and the information generated by the correspondence generation unit, Intermediate data specifying means for specifying intermediate data corresponding to the original document and corresponding to a period to which the designated time belongs, as intermediate data corresponding to the original document;
Video display means for displaying video corresponding to the original document based on the intermediate data specified by the intermediate data specifying means;
A document display device comprising: In a document display device that displays video corresponding to an original document that is different in whole or part by period,
Intermediate data generating means for generating intermediate data corresponding to the original document in a certain period, and differential intermediate data corresponding to the original document in each period after that period;
Information on the correspondence between the identification information of the original document and the intermediate data or difference intermediate data for each period, information that can specify each period, and the intermediate data or difference intermediate for each period Correspondence generation means for generating information that can identify the range of data;
If an operation for displaying a video corresponding to the original document and accompanied by a designation of time is detected, based on the designated time and the information generated by the correspondence generation unit, In each period corresponding to the original document and corresponding to the intermediate data or differential intermediate data corresponding to the period to which the specified time belongs and the original document and before the period to which the specified time belongs Intermediate data specifying means for specifying intermediate data or differential intermediate data for each corresponding period as intermediate data corresponding to the original document;
Video display means for displaying a video corresponding to the original document based on the intermediate data obtained by combining the intermediate data specified by the intermediate data specifying means or the differential intermediate data;
A document display device comprising: A document display program for causing a computer to perform the document display method according to any one of claims 1 to 20 .

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